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Class Information
Number: 379/240
Name: Telephonic communications > Plural exchange network or interconnection > Interexchange signalling > Interexchange trunk circuit
Description: Subject matter including trunk circuit switching.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7295603 |
Method and system for virtual exchange reference impact (VERI) for use in mixed spectrum management in DSL |
Nov. 13, 2007 |
| 7224686 |
Method of and apparatus for mediating common channel signaling messages between networks using a pseudo-switch |
May. 29, 2007 |
| 7039175 |
Configurable digit collection for various signaling protocols |
May. 2, 2006 |
| 6792098 |
Inter-network line level adjustment method and system |
Sep. 14, 2004 |
| 6661885 |
System and method for updating trunk group translations |
Dec. 9, 2003 |
| 6603850 |
Telephone line rollover service for ATM/ADSL based systems |
Aug. 5, 2003 |
| 6510218 |
Process for distributing engagement requests depending on direction in two-way trunk groups |
Jan. 21, 2003 |
| 6480596 |
Direct inward-outward dialing trunk circuit |
Nov. 12, 2002 |
| 6275578 |
Method and apparatus for providing back-up, in-band signaling in a communications network |
Aug. 14, 2001 |
| 6148073 |
Network centric call processing architecture using distributed call segments |
Nov. 14, 2000 |
| 5933491 |
Switched integrated network access system |
Aug. 3, 1999 |
| 5875244 |
Transmission apparatus for relaying different types of trunk signals |
Feb. 23, 1999 |
| 5844981 |
Method and system of improved routing to WATS |
Dec. 1, 1998 |
| 5774538 |
Exchange service starting system |
Jun. 30, 1998 |
| 5717750 |
Method for prohibiting continual routing of a call between central office switches due to translation data error |
Feb. 10, 1998 |
| 5414763 |
Apparatus and method for providing echo suppression to a plurality of telephones |
May. 9, 1995 |
| 5151935 |
Programmable universal signaling circuit for a telephone network |
Sep. 29, 1992 |
| 5018195 |
Fully integrated telecommunication network |
May. 21, 1991 |
| 4930153 |
PBX voice mail interface |
May. 29, 1990 |
| 4899379 |
Circuit arrangement for the connection of line circuits of a digital time multiplex-telephone network |
Feb. 6, 1990 |
| 4894860 |
Trunk interface circuitry for telephone systems |
Jan. 16, 1990 |
| 4853955 |
Apparatus and method for providing existing telephone switching equipment with the capability of using the SS7 protocol |
Aug. 1, 1989 |
| 4815124 |
DX circuit |
Mar. 21, 1989 |
| 4689816 |
Three relay C. O. trunk interface |
Aug. 25, 1987 |
| 4636584 |
Signaling protocol channel unit |
Jan. 13, 1987 |
| 4321431 |
Trunk circuit with single coupling transformer |
Mar. 23, 1982 |
| 4311879 |
AC Supervisory signal detector circuit |
Jan. 19, 1982 |
| 4310725 |
Interface for private branch exchange |
Jan. 12, 1982 |
| 4182936 |
Transformerless trunk circuit |
Jan. 8, 1980 |
| 4151377 |
High impedance loop-seizing and dial pulsing circuit |
Apr. 24, 1979 |
| 4135061 |
Device for blocking a junctor of an automatic switching system |
Jan. 16, 1979 |
| 4133982 |
AC supervisory signal detector circuit |
Jan. 9, 1979 |
| 4113986 |
Telephone controlled lock release arrangement |
Sep. 12, 1978 |
| 4087645 |
Telephone switching system |
May. 2, 1978 |
| 4058685 |
Interoffice loop supervision arrangement |
Nov. 15, 1977 |
| 4053709 |
Telephone connector |
Oct. 11, 1977 |
| 4049919 |
Communication system trunk circuit |
Sep. 20, 1977 |
| 4028498 |
Private automatic branch exchange system and apparatus |
Jun. 7, 1977 |
| 4007339 |
Arrangement serving operator assistance calls requiring routing back to originating offices |
Feb. 8, 1977 |
| 4007336 |
Class of call discriminating trunk circuit |
Feb. 8, 1977 |
| 3987252 |
Computer controlled telephone answering system |
Oct. 19, 1976 |
| 3978294 |
Return answer-supervisory circuit |
Aug. 31, 1976 |
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